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Annotation of src/usr.bin/less/ttyin.c, Revision 1.8

1.1       etheisen    1: /*
1.6       shadchin    2:  * Copyright (C) 1984-2012  Mark Nudelman
1.8     ! nicm        3:  * Modified for use with illumos by Garrett D'Amore.
        !             4:  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
1.1       etheisen    5:  *
1.3       millert     6:  * You may distribute under the terms of either the GNU General Public
                      7:  * License or the Less License, as specified in the README file.
1.1       etheisen    8:  *
1.6       shadchin    9:  * For more information, see the README file.
1.7       nicm       10:  */
1.1       etheisen   11:
                     12: /*
                     13:  * Routines dealing with getting input from the keyboard (i.e. from the user).
                     14:  */
                     15:
                     16: #include "less.h"
                     17:
1.7       nicm       18: int tty;
1.5       millert    19: extern volatile sig_atomic_t sigs;
1.4       shadchin   20: extern int utf_mode;
1.1       etheisen   21:
                     22: /*
                     23:  * Open keyboard for input.
                     24:  */
1.7       nicm       25: void
                     26: open_getchr(void)
1.1       etheisen   27: {
                     28:        /*
                     29:         * Try /dev/tty.
                     30:         * If that doesn't work, use file descriptor 2,
                     31:         * which in Unix is usually attached to the screen,
                     32:         * but also usually lets you read from the keyboard.
                     33:         */
1.3       millert    34:        tty = open("/dev/tty", OPEN_READ);
1.1       etheisen   35:        if (tty < 0)
                     36:                tty = 2;
1.3       millert    37: }
                     38:
                     39: /*
                     40:  * Close the keyboard.
                     41:  */
1.7       nicm       42: void
                     43: close_getchr(void)
1.3       millert    44: {
1.1       etheisen   45: }
                     46:
                     47: /*
                     48:  * Get a character from the keyboard.
                     49:  */
1.7       nicm       50: int
                     51: getchr(void)
1.1       etheisen   52: {
1.7       nicm       53:        unsigned char c;
1.1       etheisen   54:        int result;
                     55:
1.7       nicm       56:        do {
                     57:                result = iread(tty, &c, sizeof (char));
1.1       etheisen   58:                if (result == READ_INTR)
                     59:                        return (READ_INTR);
1.7       nicm       60:                if (result < 0) {
1.1       etheisen   61:                        /*
                     62:                         * Don't call error() here,
                     63:                         * because error calls getchr!
                     64:                         */
                     65:                        quit(QUIT_ERROR);
                     66:                }
                     67:                /*
                     68:                 * Various parts of the program cannot handle
                     69:                 * an input character of '\0'.
                     70:                 * If a '\0' was actually typed, convert it to '\340' here.
                     71:                 */
                     72:                if (c == '\0')
1.7       nicm       73:                        c = 0340;
1.1       etheisen   74:        } while (result != 1);
                     75:
1.4       shadchin   76:        return (c & 0xFF);
1.1       etheisen   77: }